Pourbaix Diagrams(2) S.J.T.U. Phase Transformation and Applications E=1.229-0.05916pH 2H2O→O2+4H+4e 1.5 02 0.5 H20 -1 01-2、345678 101112131415 △G=-zFE pH=-log10(@)=-l0g1o[H*] .5 H2 pH→ Figure 6.3 Pourbaix diagram for water,hydrogen,and oxygen;Pand Po.=1 atm. SJ IU Inermoaynamics or Materiais Spring∠UUǒgx.J.Jln Lecture 11 Electrochemistry ll
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Springl 2008 © X. J. Jin Lecture 11 Electrochemistry II Pourbaix Diagrams (2) E = − 05916.0229.1 pH −+ 2 2 2 ++→ 44 eHOOH Δ = −zFEG ][log)(log10 10 + pH −= + −= H H α
Pourbaix Diagrams (3) S.J.T.U. Phase Transformation and Applications 1.5 02 0.5 P02=1 atm H20 P02=10-4 atm 3456789101112131415 -0.5 PH2=10-4 atm H2 PH2=1 atm -1 pH→ Figure 6.4 Pourbaix diagram for water,hydrogen,and oxygen showing P,and Po at both 1 and 104 atm. SJTU Thermodynamics of Materials Springl2008©X.J.Jin Lecture 11 Electrochemistry ll
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Springl 2008 © X. J. Jin Lecture 11 Electrochemistry II Pourbaix Diagrams (3)
Pourbaix Diagrams (4) S.J.T.U. Phase Transformation and Applications 2.0 logaCu2+=10-4 logaCu2-=10-4 Cu2+ Cuo 1.0 cu0吃 0 Cu20 Cu -1.0 0 2 4 68101214 pH→ Figure 6.5 Pourbaix diagram for copper in water(selected activ- ity levels for Cu2+and CuO?).(From Ref.1.) lectrochemistry ll
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Springl 2008 © X. J. Jin Lecture 11 Electrochemistry II Pourbaix Diagrams (4)
Concentration Cells(1) S.J.T.U. Phase Transformation and Applications Cu→Cu2+[I]+2e 2e+Cu2+[I]→Cu Cu2+[II]→Cu2+[I] Cu Cu G=0E=0 Cu2+ Cu2+ I I RT. E=- In 0'c2*0 Figure 6.6 Schematic diagram aF acun of concentration cell. SJTU Thermodynamics of Materials Springl2008©X.J.Jin Lecture 11 Electrochemistry ll
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Springl 2008 © X. J. Jin Lecture 11 Electrochemistry II Concentration Cells (1) + − → + 2][ eICuCu 2 + → CuIICue− + 2 ][ 2 ][][ 2 2 ICuIICu + → + =Δ 0 o G =0 o E ][ ][ 2 2 ln IICu ICu zF RT E + + −= α α
Concentration Cells(2) S.J.T.U. Phase Transformation and Applications C41→Cu2++2e 2e-+Cu2*->Cum Cu,→Cum Cu Cu AG°=0E°=0 Cu2+ Cu2+ Ⅱ RT E Figure 6.6 Schematic diagram In dCun of concentration cell. zF C SJTU Thermodynamics of Materials Springl2008©X.J.Jin Lecture 11 Electrochemistry ll
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Springl 2008 © X. J. Jin Lecture 11 Electrochemistry II Concentration Cells (2) −+ +→ eCuCuI 2 2 →+ CuCue II − 2+ 2 I → CuCu II =Δ 0 o G = 0 o E I II Cu Cu zF RT E α α −= ln